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Improving the pass-band return loss in liquid crystal dual-mode bandpass filters by microstrip patch reshaping

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Figure

Figure  1.  Geometry  of  a  microstrip  square  patch  resonator  with  a  central  square  notch  (dual-mode)
Table 1. Results for the dimensions of the conventional dual-mode patch. Some concerned  parameters are: bandwidth (BW), central frequency (f c ) and input impedance (Z in )
Table 2. Comparison between the performances of both dual-mode filters.
Figure 6. LC driving voltage dependence of the S 11  parameter for the new bandpass filter
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